Among the Hidden by Margaret Peterson Haddix
Luke Garner is child number three in a futuristic country where families are only allowed to have two children. The Garners live in the country, so Luke is occasionally able to go outside to play with his brothers. But when a new house development is built behind his house, Luke is forced to hide in the attic. Just when he thinks that he will spend the rest of his life hidden in an attic, Luke sees another child's face in the window of the house behind them-a house where two children already live.
Will Luke have enough courage to go meet the other third child? And if he does, will they be able to fight against the government?
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